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(abc)/√((a+b+c)(b+c−a)(c+a−b)(a+b−c)), a=1, b=sqrt(5)/2, c=sqrt(5)/2
(abc)/√((a+b+c)(b+c−a)(c+a−b)(a+b−c)), a=1, b=sqrt(5)/2, c=sqrt(5)/2
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